Signaling system and apparatus therefor



Feb. 24, 1931. E. E. KLEINSCHMIDT 7 1,793,700

SIGNALING SYSTEM AND APPARATUS THEREFOR so, 1925 a Sheets-Sheet 1Original Filed Jan.

INVENTOR ATTORNEY Feb. 24, 1931. E. E. KLEINSCHMIDT 1,793,700

SIGNALING SYSTEM AND APPARATUS THEREFOR Original Filed Jan. 30, 1925 3Sheets-Sheet 2 3 nve nl'oz Feb. 24, 1931.

E. E. KLEINSCHMIDT SIGNALING SYSTEM AND APPARATUS THEREFOR OriginalFiled Jan. 30, 1925 3 Sheets-Sheet 3 HHEIEJEL! HE] ueleua EIHLI 9 Bqwaawamtflfuuauu- Illlllllllll Patented Feb. 24, 1931 UNITED STATESPATENT OFFICE EDWARD E. KLEINSGHMIDT, OF EVANSTON, ILLINOIS, ASSIGNOR TOTELETYPE COR- PORATION, OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARESIGNALING SYSTEM AND APPARATUS THEREFOR -App11cation filed J'anuarySO,1925, Serial No. 5,740. Renewed September 17, 1929.

The present invention relates to improved systems of telegraphy andapparatus therefor.

More particularly, the invention relates to improved printing telegraphsystems and improved transmitting, receiving and dist-ributing apparatustherefor. The invention 1s especially adapted for use in a lowfrequen cysingle channel system and has for one of its objects the elimination oftroublesome rotary distributors, and the usual correcting apparatusnecessary to establish and maintain concordance of action between rotarydistributors.

Another object of the invention is the provision of novel correctingmeans in which the correcting impulses now commonly utilized areeliminated, and in which normal reversals of current on the linemaintain proper concordance of action of the receiving and transmittingapparatus; to produce a simplified, reliable system that will functionat minimum line frequencies, and to provide a novel system of signalingin which alternations are normally transmitted to the line and theselections are. efiected by reversing the alternations. In this manner aselecting or marking impulse may be of either polarity and the length ofany impulse of either polarity is limited whereby charging of the lineis reduced to a minimum, and for this reason the system is especiallyuseful on high capacity lines.

Because of the fact that the special correcting impulses are eliminated,the usual interval utilized in single channel systems of the well knownstart-stop type for the transfer of selections in the receiver issubstantially eliminated.

A further object of the invention is to provide an improved andsimplified receiver which is especially adapted for use in the presentsystem, in which an overlap may be attained without the usual intervalbetween selecting combinations to allow for the transfer and storage ofselections in the receiver.

Still other objects of the invention are the provision of a noveltransmitter control in which each impulse is timed from the transimpulsestoring means at the transmitter; and theprovision of a novel stoparrangement in which the transmission is controlled either manually orby the tension of a transmitting tape in a. manner to prevent mutilationof signals even though the signals are made up solely of selectingimpulses and are not separated by correcting or stop intervals.

Further objects of the invention are such as may be attained byutilization of the Various combinations, subcombinations and principleshereinafter set forth and defined by the terms of the appended claims,in the various other relations to whichthey are obviously adaptable.

Referring to the drawings Fig. 1 is a circuit diagram showing theinvention as applied to a single channel system. Fig. 2 is aside-elevation of the improved tape transmitter. I

Fig. 3 is a fragmental plan view of the transmitter shown in Fig. 2.

Fig. 4 is a fragmental plan view showing the stop and clutchmechanism.

Flg. 5 is a sectional side view of the mechanism shown in Fig 4 Fig. 6is a fragmental front elevation showing the essential parts andarrangement of the improved receiver.

Fig. 7 is a fragmental sectional side elevation With parts broken awayto show the receiver selector and escapement parts.

Figs. 8 and 9 are fragmental views showing the details of theselectorbar latch mechanism.

To effect the proper timing of the transmitters and receivers, and todistribute the impulses properly, tuning forks or vibrating reeds arerelied upon and no other distributing means are utilized. Thetransmitting.

fork is relied upon as the master timing or pace setting fork, and thereceiving fork is controlled by the reversals of line current to remainsubstantially in step with the trans- I 'mitting fork. To insure aproper control,

the receiving fork is preferably timed to vibrate naturally atsubstantially the same as the transmitting fork, and before the amountof phase difference becomes great N b 741578 fil d O t b 4 1924, or asum er e c er f magnet 93 by conductor 94 to contact 95 of enough toaffect the operation, the vibration of the receiving fork is corrected.

In Fig. 1, t e transmitting fork 1 is secured to a fixed support 2 andis provided with tines 3 and 4 upon which are secured adjustable Weights5 and 6 for the pur ose of regulating the vibration rate of the ork.Secured to tines 3 and 4 are insulating contact operating members 7 and8 which as the tines 3 and 4 spread and come together, alternately andsimultaneously close and permit fixed contacts 9, 10, 11 and 12 to open.Connected in series with these contacts is a magnetic drive magnet 13and a battery 14. To start the fork into vibration, the tines arestressed by hand and released. The movement of the tines outward closesa circuit through magnet 13 which then attracts the tines and draws theminward. As the tines move inward, contacts 9, 10, 11 and 12 separate andde-energize the magnet 13. In this manner the fork is kept inpowerful'vibration at a uniform and predetermined rate.

Secured to the ends of tines 3 and 4 are insulating contact operatingmembers 15 and 16. Member 15 alternately and successively opens andcloses contacts 17, 18, 19 and 20. Contacts 17 and 20 are connected totransmitting tongues 21 and 22 of polarized transmitting relays 23 and24, and contacts 18 and 19 are connected to line conductor 25. Member 16alternately and successively opens and closes contacts 26, 27, 28 and29. Contact 26 is connected to the winding of transmitting relay 23,contact 29 is connected to the winding transmitting relay 24, andcontacts 27 and 28 are connected by conductor 30 through transmittercontrol magnet 31 to the midpoint between connected batteries 32 and 33.The outer terminals of batteries 32 and 33 are connected throughresistances 34 and 35 to fixed contacts 36 and 37. In the form shown,magnet 31 actuates armature or escapement member 38 which controlsescapement wheel 39. Escapement wheel 39 is mounted upon and controlsthe rotation of a pin barrel or cam shaft 40 which may be controlled asmore fully set forth in co-pending application, Serial hereinafter setforth in the description 0 Figures 2 to 5, to actuate a transmittingtongue 41 in accordance with code combinations to be transmitted. Itwill be understood, however, that the transmitter is not limited to myimproved pin barrel type shown in the copending application, or ashereinafter set forth, but any of the single contact combination codetransmitters may be adapted for use in the system by timing the impulsesof the transmitted signals from the transmitting fork. Tongue 41 isactuated between contacts 36 and37 and completes energizing circuitsthrough relays 23 and 24, magnet 31 and batteries 32 and 33, causingtongues 21 and 22 to engage contacts. 42, 43, 44 and 45 respectivelyapplying code combinatlons of positive and negative impulses from ground46, batteries 47 and 48, over reslstances 49 and 50, contacts 17, 18, 19and 20, to line 25, as will more fully hereinafter appear. 1

Impulses passing over line 25 actuate polarized line relay 51 inaccordance with their polarity and pass to ground 52. Tongue 53 of relay51 is actuated between contacts 54 and 55 in accordance with thereceived impulses. Contacts 54 and 55 are connected through resistances56 and 57 to the end terminals of a split battery 58. The midpoint ofbattery 58 is connected to a local. circuit comprlsing conductors 59,polarized relays 60 and 61 and tongue 53. Tongue 62 of relay 61 is adated to engage fixed contacts 63 and 64. ontacts 63 and 64 are connectedby conductors 65 and 66 to contacts 67 and 68 which in turn are adaptedto engage fork actuated contacts 69 and 70. Contacts 69 and 70 areconnected by conductors 71 through selector magnet 72 and battery 73 totongue 62. Selector magnet 72 through armature 73' controls cam shaft 74of the receiver in accordance with the received code combinations toprint the desired character, as will more fully hereinafter appear inthe description of Figures 6 to 9. Magnet 75' actuates escapement orstepping armature 76 which controls the,rotation of cam shaft 74 throughescapement wheel 77 or through other suitable arrangements, as will morefully hereinafter appear. Magnet 75 is connected in series with battery78 through contact 79 and fixed contacts 80 and 80, contact 79 beingactuated by an insulating member 81 carried on tine 82 of receivingfork83. Contacts 67, 69, 68 and 70 are actuated by an actuating member 84 ofinsulation secured to tine 82. Tine 82 of fork 83 has secured thereto anactuating member 85 of insulation which actuates contacts 86 and 87causing engagement thereof alternately and successively with fixedcontacts 88 and 89. Contacts 86 and 87 are connected through condenser90 to tongue 91 of relay 60. Contact 88 is connected through battery 92to relay 60, and contact 89 is connected in series through drive magnet96 by conductor 97 to contact 98 of relay 60. Weights 99 and 100 areprovided. on tines 82 and 84 to adjust the rate of vibration of thereceiving fork.

Operation of system Inoperation the transmitting fork is started byhand. As tines 3 and 4 spread apart, the drive circuit through magnet 13is completed by closure of contacts 9, 10, 11 and 12, causing the tinesto be attracted. As the tines move inward, the circuit through be inclosed position, as shown in Fig. 1,

impulses in unison with the line reversals will be sent alternatelythrough magnets 93 and 96 causing the receiving fork to start intovibration in proper phase relation with the received impulses and toalternately open and close the fork controlled contacts. The receivingfork will also start into vibration in responses to the line reversalsif only one pair of contacts 86 and 88 or 87 and 89 are normally closedwhen the receiving tine 84 is at rest. With contacts 86 to 89 normallyopen when tine 84 is at rest, the receiving fork must be started byhand. In th s case operation of the line relay in response to reversalswill attract attention of the receiving operator; or for this purpose anordinary Morse key and sounder may be provlded. The receiving operator,then may start the receiving fork into vibration by hand.

At the transmitting station, as tmes 3 and 4 move outward contacts 17and 18 will be closed by tine 3 connecting tongue 21 of relay 23'to theline to transmit an impulse 1n accordance with the position of tongue21. At the same time contacts 28 and 29 are closed by tine 4 and acircuit is completed from tongue 41 of the transmitter through battery32 or.

33, magnet 31 and nelay 24. Energization of magnet 31' actuatesescapement 38andperm1ts shaft 40 to rotate. As shaft 40 rotates it willb position tongue 41 in accordance with the next impulse to betransmitted from tongue :22, and relay 24'will be energized to positiontongue 22 for the next impulse. As the tines come together, contacts 1718, 28 and 29 are opened, and contacts 19, 20, 26 and 27 are closed. Theinterruption of contacts 28 and 29 interrupts the energizing circuit formagnets 24 and 31. Tongue 22 of magnet 24 will remain where set, andarmature 38 of magnet 31 will be positioned in the path of the nexttooth on escapement wheel 39' and will arrest shaft 40 after the impulsehas been transmitted to position tongue 22, as will more fullyhereinafter appear in the detailed description of the transmitter. Theinterruption of contacts 17 and 18 disconnects tongue 21 from the lineand the closing of contacts 19 and 20 connects tongue 22 of relay 24tothe line to transmit the impulse stored therein. Closing of contacts 26and 27 completes a circuit from transmitter tongue 41, through battery32 or 33, magnet 31, and relay 23. Energization of magnet 31 as aboveset fonth permits shaft 40 to rotate to position tongue 41 for the nextimpulse to be transmitted from 21, and as tines 3 and 4 separate,contacts 19, 20, 26 and 27 will be permitted to separate, and contacts17, 18, 28 and 29 will be closed. Interruption of contacts 27 and 26causes deenergization of magnet 31 and armature 38 thereof will arrestcam shaft 40 has been sent to relay 23 and the cycle of operations asabove set forth will be repeated. It will'be apparent that while animpulse is being transmitted from one of the relays 23 or 24, the otherof these relays is being conditioned for transmission of the nextimpulse so that the impulses from the tongues 21 and 22 are alternatedin a definitely timed relation determined by the vibration of the fork.The length of, each impulse is determined by the speed of vibration ofthe transmitting fork and tongue 41 of the transmitter need not sendfull length impulses to relays 23 and 24, and a storage or overlap ofone impulse is provided. With the tongue 41 0f the transmitter againstthe spacing contact, current reversals are sent to the line and for eachmarking impulse the polarity of an impulse is reversed.

At the receiving station movement of tine 82 outward closes contacts 67and 69 con-' necting selecting magnet 72 in circuit with battery 73 andtongue 62 of relay 61, and at the same time closes contacts 79 and 80cans mg ma net to energize. Energization magnet 5 permits rotation ofcam shaft 73. With the forks in synchronism and spacing conditions beingreceived, tine 82 will move in unison with tongues 53 and 62. Tongue 62will engage contact 63 as contacts 67 and 69 close, and the circuitthrough magnet72 will e'op en at contact 64. If a marking condition 1sreceived as contacts 67 and 69 close, tongue 62 will be moved intoengagement with contact 64 causing magnet 72 to energize. 'Energizationof tating shaft 74 endwise and effects a select ve'setting of thereceiver mechanism. As tine 82 moves inward, contacts 67, 69, 79 andwill be interrupted and magnets 72 and 75 will de-energize permittingshaft 74 to restore to unactuated position, and armature 76 to arrestthe rotation of the shaft after it hasmoved through an angular distanceallotted to one impulse. As the movement of tme 82 continues, inwardcontacts 68, 70, 79 and 80 will be closed and magnet-75 will agamenergize, permitting shaft 74 to rotate for the reception of the nextimpulse and connecting magnet 72 again in circuit with battery 73 andtongue 62. If the incoming lmpulse is a spacing condition, tongue 62will be against contact 64, and magnet 72 will remain de-energized. Ifthe impulse is a marking condition, tongue 62 will engage contact 63 andmagnet 72 will energize causing a selecting movement of shaft 74. On theoutward movement of tine 82 contacts 68, 70, 79

after the impulse magnet 72 shifts roand 80' are opened permittingmagnets 72 and 7 5 to de-energize. De-ener ization of magnet 7 5 arrestsrotation of sha t 7 4 at the end of the selecting interval, and themovement of'tine 82 continues outward closing contacts 67 69, 79 and 80for the reception of the next impulse.

In this manner it will be clear that so long as spacing impulses arereceived, tongues 53 and 62 will vibrate in unison and in phase with thetine 82,- magnet 75 will energize with each impulse to permit rotationof shaft 71, but magnet 72 will not energize. Whenever a marking impulseis received, the movement of tongues 53 and 62 will be opposite in phaseto the movement of tine 82, and magnet 72 will energize to produce aselective setting of the shaft 74.

Receiving fork drive and! synchronization In operation the transmittingfork is started vibrating manually, and the receiving fork either startsautomatically or is manually started, as above set forth. Fork 1 is thepace setting fork for the system and is timed to vibrate so that thedesired speed of transmission is attained, one impulse being transmittedfor each inward movement, and one impulse being transmitted'for eachoutward movement of the tines. The receiving and transmitting forks aretimed to vibrate as nearly as possible at the same rate of speed. Whenthe receiving fork is in synchronism or unison with the receivedimpulses, and spacing impulses are received, tine 82 changes positionsimultaneously and in phase with the changes in position of tongues 53,62 and 91. With thereceiving fork in synchronism and tongue 91 of relay60 against contact 95 in response to a received spacing impulse, tine 84will be to the left in Fig. 1 with contacts 86 and 88 closed. A chargingcircuit will then be completed through condenser 90, tongue 91, contact95, neutral drive magnet 93, and battery 92, cansing a surge of currentthru magnet 93 due to charging of condenser. The energization of magnet93 caused byv this current momentarily attracts tines 82 and 84supplying energy to the fork and correcting any lack of synchronism. Asthe tine 84 returns to the right, contacts 86 and 88 will separate andcontacts 87 and 89 will close. If the next impulse is a spacing impulse,tongue 91 will engage contact 98, and condenser 90 will dischargethrough drive magnets 96, and causing a drive and correcting pulsethrough these magnets which acts to spread the tines. \Vith thereceiving fork in synchronism with the incoming impulses, whenever amarking impulse is received, tongue 91 will'engage contact 98 whencontacts 86 and 88 are closed, and will engage contact 95 when contacts87 and 89 are closed, so that when marking impulses are received nocharge or discharge of the condenser 91 can occur and the mechanicalvibration of the fork controls the contacts.

In starting the operation of the system, spacing conditions aretransmitted. With the receiving fork 180 degrees out of base, as mayoccur in manual starting of t e receiving fork, no impulses can passthrough magnets 93 and 96 so that the vibrations will gradually die awayand the proper phase relation will be approached. As the receiving forkdrops into phase, circuits will be completed through the magnets 93 and96 as above set forth, and the receiving fork will then be pulled intoand will be held in synchronism by the drive magnets. During thetransmission of messages, on each spacing impulse a correcting and drivepulse will pass through magnets 93 and 96 and during marking impulsesthe receiving fork will vibrate mechanically and naturally in unisonwith the received impulses.

Orientation Because the receivers have no normal or unison position fromwhich they may be started at predetermined intervals, it is necessarythat some means of orientation or letter finding be provided for use instarting proper reception. This is accomplished by having thetransmitter or transmitters send test messages, and the receivingoperator will then momentarily interrupt the operation of escapementmagnet 75 b interrupting the energizing circuit there or with a suitablekey (not shown) or by holding armatures 76, so that the relation of camshaft 74 with respect to the incoming impulses will be altered until theproper relation is reached, at which time the receiver will recordintelligible messages. The orientation having been effected, regulartransmission may proceed.

Transmitter A simplified form of transmitter especially adapted for usein the present system is disclosed in Figures 2 to 5. Tongue 41 ispivotally mounted on a suitably supported fixed spindle 98 (Fig. 2) andis normally held out of engagement with adjustable contact 36 andinengagement with adjustable cont act 37 by means of spring 99 securedto an operating bar 100 of tongue 41, and to a fixed pin 101. Bar 100extends transversely across the transmitter and is adapted to beoperated by five contact operating members 102 pivotally mounted on afixed spindle 103. Members 102 are each provided with an extension 104to which are secured springs 105 individual thereto and normally tendingto cause movement of members 102 in a clockwise direction. Each member102 is provided with an extension 106 guided in a comb 107, andpivotally mounted on extensions 106 are tape conwhile the upper end offinger 112 is guided in trolled fingers 108to 112. The upper ends offingers 108 to 111 are guided in circular holes formed in guide plates113 and 114,

upward successively into depressions 117.

Upward movement of members 106 permits fingers 108 to 112 to movesuccessively into engagement with perforated control tape 118 which isprovided with transverse rows or groups of perforations in accordancewith the code combinations to be transmitted.

Tape 118 is provided with a central row of feed'perforations whichco-act with the teeth of atape feed wheel 119 in well known manner toefiect the advance of the tape. Feed wheel 119 is mounted on a shaft 120which has a toothed drive wheel 121 secured thereto. A drive member 122mounted for reciprocation in suitable guides (not shown) is adapted toengage the teeth of wheel 121 and to advance shaft 120 and feed wheel119 a distance equal to the spacing between successive groups of tapeperforations for .each reciprocation of member 122. A centering member123, pivotally mounted on an adjustable member 124 is forced intoengagement with the teeth of wheel 121 by a sprin 125 and centers thetape feed wheel 119 to ring the tape perforations in proper alignmentwith the upper ends of the tape fingers. Member 124 is supported againstthe frame work on a projection 126 and may be adjusted by means ofscrews 127. Pivotally connected to the end of member 122 is a link i128, the other end of which is pivotally connected to arm 129 of a bellcrank 130. Bell crank 130 is pivotally supported at 131 and supported onarm 132 thereof is aroller 133 which is held in engagement with cam 134on shaft 40 by the action of spring 135 secured to and urging member 128to the right in Fig. 2.

Cam shaft 40 extends beyond cam 134 (Fig. 4) and has secured thereto adrive key which fits slidably into a groove 137 formed in clutch member138. Clutch member 138 is slidably mounted on shaft 40. and is pressedto the left by a helical spring 139 interposed between cam 134 and theend of member 138. Formed on the outside of member 138 is a spiralgroove 139 into which a member 140 is adapted to fit. Member 140 ispivoted at 141 (Fig. 5) in a supporting and guide member 142, and isconnected at its opposite end by a spring 143 to a control arm 144 whichin turn is pivoted at 145 to support 142.

Arm 145 maybe formed with an extension 146 under which tafie 118-isadatpted to pass.

projecting Formed integra y with an from member 138 is adrive finger 147which is adapted to seat in a drive-notch 148 formed in an end face ofclutch drive member 149. The end of shaft 40 extends into and isjournaled in member 149 which is rigidly secured to and rotatable withdrive shaft 150. Shaft 150 is driven from a continuously rotating motor(not shown) through a continuously driven; ear 151, rotatable shaft 150,and friction c utch members 152 secured to shaft 150 and driven by gear151. Rigidly secured to shaft 150 is a ratchet or escapement wheel 39provided with five teeth 153 each of which 1s adapted to engage a stopshoulder on armature 38 when the armature is shifted to the right inFig. 2 under influence of spring 154. The position of teeth 153 withrelation to cam depressions 117 is such that for each rotation of shaft40 an angular distance of one tooth,-one impulse will be transmitted bytongue 41, and the shaft will be arrested with the transmitting camsbetween impulse transmitting positions when any tooth 1 53 engages theshoulder on armature 38.

Transma'tteriopemtimz In operation, magnet31 is energized and.de-energized in response to closing of fork actuated contacts 26 to 29,and for each energization thereof shaft 40 is freed for a rotation ofthe distance between successive teeth 153. Fingers 108 to 112 arepermitted to move upward successively as the respective cam depressionsrotate past members 106. If a perforation exists in the tape above therespective fingers, the corresponding members 102 will move downwardsufficiently under influence of springs 105 to shift tongue 41 fromengagement with contact 37 to engagement .with contact 36 and a markingimpulse will be transmitted to relay 23 or 24. If no perforation existsin the tape, the respective finger will arrest the downward movement ofthe corresponding member 102 before tongue 41 can be shifted and aspacing condition will accordingly be transmitted. Immediately aftertongue 112 has moved upward into engagement with the tape, and whiletongue 41 is transmitting the fifth or last impulse of t a codecombination, roller 133 drops into the 'notch of cam 134 and shiftsmember 122 to the right in Fig. 2, causing rotation of toothed wheel 121to bring the next group of perforations over the tape fingers. Finger112 will be carried to the left in slots 115 against the tension ofspring 116 in this movement. As finger 112 moves downward out ofengagement with the tape, spring 116 restores it to the right. It willbe noted that the transmission of successive code combinations proceedscontinuously and the feed of the tape occui s intermittently during thetransmission of the last impulse of each code combination.

During transmission, finger 147 of clutch member 138 rests in notch 148of member 149, and member 140 is held out of groove 139 by the weight ofarm 144. To arrest transmission arm 144 is raised either-manually or byincreasing the tension of ,tape 118 pressing under extension 146 in wellknown manner by cessation of the perforating operation. As 144 is raised140 will be thrown downward into groove 139 by the action of sprin 143-,and as member 138 rotates it will be s ifted to the right .in Fig.4until tooth 147 is disengaged from notch 148. The parts are so .arrangedthat at this point roller 133 will drop into the notch on cam 134 andwill hold shaft 40 from rotating after the fifth impulse of a codecombination has been transmitted under control of finger 112, and justbefore the first impulse of the succeeding code combination is to betransmitted under control of finger 108. In this position of. partstongue 41 will' be held against contact 37 and will transmit spacinconditions to relay 23 and 24. It will be noted that the depressions 117are so shaped that between each impulse tongue 41 will be broughtagainst contact 37.

After tongue 147 is disengaged from notch 148 magnet-31 will continue tobe energized under the control of the transmittin fork and shaft 150will continue to rotate. When transmission is to be started member 144is lowered either manually or by slacking of the tape and member 140 israised out of groove 139. Spring 139' will then force member 138 to theleft in Fig. 4, and when notch 148 registers with tongue 147, the tonguewill enter into the notch and shaft 40 will again be driven with shaft150. Transmission will then proceed as above set forth. It will be notedthat transmitter operation is arrested only between completed. codecombinations and spacing conditions are transmitted during thisinterval. It will also be noted that once the transmitter operation isarrested, it can be resumed only after shaft 150 has made one or morecomplete revolutions during which the receiver cam shaft is stepped inunison with shaft 150. In this way proper orientation of the receiver ismaintained.

Receiving apparatus The mechanisms of the selector and printer'are forthe most part the same as disclosed in copending applications, SerialNumber 649,562, filed July 5, 1923, and Serial Number 656,857, filedAugust 11, 1923. Accordingly, only so much of these mechanisms as willdisclose their relation to novel parts herein disclosed will be shownand described.

Incoming impulses are distributed in properly timed relation byreceiving fork 83 to selector magnet 72 and escapement magnet 75. Magnet75 actuates armature 76 against the tension of spring 154 and removesshoulder 155 thereof from engagement with teeth 156 of ratchet wheel 77,ermitting shaft 157 upon which 77 is mounted to rotate an angulardistance allotted to the reception of one impulse for each energizationof magnet 75. Shaft 157 is suitably journaled in bearing 158 and isfrictionally driven by means of springs 158' secured in a friction drivemember 159 mounted on a shaft 160 which is journaled in bearings 161 andis driven through gears 162 and 163 from a continuously rotating motor.Parts 159 to 163 correspond to parts 25 to 28 of copending application,Serial Number 649,562. Rotatably and slidably journaled in the end ofshaft 157 is an extension 164 of cam shaft 74. Secured to shaft 157 is aslotted drive member 165, into the slot of which a cam and drive pin 166secured to cam shaft 74- slidably fits. Secured to and spirally spacedaround cam shaft 74 are selector actuating cam pins 166 and 170. Cams166 to 170 correspond to the five cams 54 to 58 of copendingapplication, Serial Number 649,562. Cam shaft 74 is provided with anextension 171 slidably journaled in a bearing 172, and forced intoengagement with armature 73 of magnet 72 by a helical spring 173interposed between member 165 and cam 166 which normally forces the camshaft to the left in Fig. 6. It will be noted that the startplicationare eliminated. Otherwise the structure and operation of these cams issub- (not shown) of the same structure and in the same manner as thefingers 37 to 41 of the copendln cases are controlled. Selector 'fingers174 to 178 control the position of notched selector bars 179 to 183(Fig. 7 corresponding to bars 59 to 63 of the copending case, bars 179to 183 being normally urged to the right in Fig. 6 by springs 184corresponding to springs 65 of the copending case. The position of bars179 to 183 selectively controls actuating bars 185 corresponding toactuating bars 108 of the copendin case, and bars 185 are actuated by aprinting ail strucstop pin and mechanism of the copending apturecorresponding to the bail structure of the copending case. ,7

Immediately after the fifth selecting impulse has been received and thefin er 17 8 has been set, member 186 correspon ing to member 73 of thecopending case is tripped by a local control cam as disclosed in thecopending case. This permits bell crank 187 and selector bar and controlmember 188, corresponding to members 76 and 77 of the copending case, tomove spindle 189, corresponding to spindle 79 of the copending casecontrolled by the selector bars,

'has dropped in a cldckwise direction. As set forthinthe copending casethis permits the selected ones of the selector bars to move to actuatedposition and movement of spindle 189 trips the rinter control clutch andstarts the printer bail tocomplete the selected operat1on.- As set forthin the copendingcase the printer bail permits the selected actuating barto move into the aligned slots, moves it across the slots to effect aprinting stroke'and then removes it from the slots. After the actuatingbar is moved from the slots, spindle 189 is actuated to restore theactuated ones of the selector bars to the left in Fig. 6, ready to moveto the selected positionsfor the succeeding code combination. A full.understanding of the mechanisms and operation and of the selector fingercontrol operation and functions will be had by reference to thecopending application, Serial Number 649,562, and further detail willnot be given here for this reason. Owing to the fact that the start andstop intervals of the signals of the copending application areeliminated in the present case, the first impulse of a succeeding codecom bination immediately follows the fifth impulse of the preceedingcode combination. Therefore, to insure the proper functioning of theselecting mechanism it becomes necessary to store the settingof thefirst pulse selector bar 17 9 until the selected actuating bar into thealigned slots, otherwise setting of finger 174 for the succeeding codecombination would interfere with the position of bar 17 9 in thepreceding combination. A notch 190 is cut into the lower edge of bar 179. Pivoted to the frame work at 191 is a latch member 192 provided witha cam projection 193. A spring 194 holds cam projection 193 inengagement with pin 194 secured to member 188. The end of 192 is adaptedto drop into notch 190 when bar 179 is in unactuated position and member188 is ,tripped as shown in Fig. 8, and when bar 179 is in actuatedposition with 188 tripped,.as shown in Fig. 9, latch 192 will engage thelower surface of the bar 179.

It will be noted that the only changes in the receiver of the copendingapplication are the elimination of the start and stop mechanism, and theprovision of the storage mechanism for the first selector bar tocompensate for the time interval of the start and stop during which theselection is transferred from the selector fingers to the selector barsin the copending case.

Receiver operation In operation, the impulses are received and shaft 74is timed in rotation by the receiving fork to rotate in unisontherewith, while mag- As member 174 is being set, finger 17 6 isrestored from the previous selection; while finger'1'75 is being set,177 is restored; while 176 is beingset, 178is restored; and whilefingers 177 and 178 are being set, the fingers 174 to 17 6 remain set.vAs soon as finger 178 is set, and

towards the end of the fifth impulse, latch 186 is trip ed by the localcontrol cam permitting mem ers 187 and 188to .move clockwise. 188 movesto the right, spring 194 will force the end of latch 192 upward.

finger 174 was not set so that bar 179 is to remain in unactuatedposition, the end of latch 192 will move into slot 190, as shown in Fig.8. 'If on the other hand, latch-174 is set so that bar 179 is to move'toactuated position, then as member 188 moves to the right,

bar 17 9 W111 follow, and as the end of 192 moves upward it will engagethe lower.surface of 179 as shown in Figure 9. As soon as the pointisreached where the end of 192 will enter slot 190 and hold bar 179,fingers 174 and 17 5 are restored. The parts are so timed that 192enters slot 190 and fingers 17 4 and 175 are restored at the end of thefifth impulse. The fingers 17 4 to 17 8 may then be immediately set inaccordance with the succeeding code combination. Latch 192 insures theholding of bar 179 in the position corresponding to the preceding codecombination, and the printing of the selected character proceeds whilethe succeeding code combination is being set on'the selector fingers.The printing is completed and member 188 restores bars 179 to 183 andremoves latch 192 from engagement with bar 179, just in time to take upthe positions in accordance with the succeeding selection. In

this manner, it will be apparent that a'complete overlap of selectionand printing is attained without any interval between succeeding codecombinations.

Because the transmitting sible at the same speeds, the system may beoperated with fork controlled repeaters.-

/ properly selective networks and transformer arrangements to transmitthe various impulses to selectively receive them from the line, thepresent system may be multiplexed.

Having described preferred embodiments and receiving forks are timed tovibrate as nearly as posof the invention, what is desired to be securedI by Letters Patent and claimed as new is:

1. A selecting system comprising means for tralismitting normalsuccessive impulses of opposite polarities, means for reversing thepolarity of predetermined ones of said impulses, and a selectingreceiving mechanism connected for operation in response only to saidimpulses of reversed polarities.

2. A'selective signaling system comprising vibrating means; saidvibrating means to transmit successive uniform length impulsesalternating in polarity, and means for reversing the polarities ofcertain of said impulses.

3. The combination asset forth-in claim 2 in which said last mentionedmeans are timed in operation by said vibrating means.

4. The combination as set forth in claim 2 in which said last mentionedmeans comprises an escapement, and a single tape controlled electricalcontact controlled by said escapement.

5. A selective signaling system comprising vibrating means timed inoperation by received impulses of normally alternating polarities; and areceiving selector timed in operation by said vibrating means; saidselector being responsive ,only to said received impulses when saidnormal polarities are reversed in character.

6. A signaling system comprising normally vibrating means fortransmitting selecting impulses at a predetermined rate, a receivingselector responsive to said selecting impulses; and vibrating meanstimed said selecting impulses controlling said receiving selector. 4

7. A transmitter adapted to transmit code combinations of marking andspacing conditions in rapid succession without a substantial timeinterval between succeeding code combinations comprising a plurality oftape fingers, a control tape for said fingers; a cam shaft controllingthe movement of said fingers a clutch driving said cam shaft, and Pmeans actuated by the tension of said tape for causing disengagement ofsaid clutch to arrest rotation of said cam shaft only between completelytransmitted signals.

8. The combination as set forth in claim 7 in which said clutch isdriven by a frictionally drivenescapement controlled shaft.

9. A printing telegraph selector comprising a plurality of notchedselector bars; means responsive to received code combinations ofimpulses controlling said selector bars, and means for storing thesetting of one of said bars'to permit a complete overlap to be obtainedin said selector without a transfer, and storage interval betweenselecting conditions of successive code combinations of said receivedimpulses.

10. In a signaling system, a pair of transmitting relays, transmittingmeans selectively and alternately controlling the transmitting positionsof said relays, and a common vibratory means timing the operation ofsaid means controlled by.

in operation by relaysand said transmitting means, .andthe length oftransmitted impulses.

11. The method of selective signaling which comprises transmittingnormal sue cessive spacing conditions made up of electrical impulses ofalternate positive and negative polarity, maintaining a receiverunresponsive to these impulses, and reversing the normal polarity of oneof these impulses for operating the receiver.

12. In a signaling system, means for transmitting impulses of alternatepositive and negative polarity, a receiver unresponsive to saidalternations of impulses, and means for reversing the polarity of one ofsaid impulses, said receiver being responsive thereto.

13. In a signaling system, means for transmitting impulses of alternatepositive and negative polarity, means for reversing the polarity of oneof said impulses and a receiver unresponsive to said alternations ofimpulses and responsive to said reversed normal impulse.

14. In a signaling system, means for transmitting impulses of alternatepositive and negative polaritv, means for reversing the polarity of oneof said impulses and a receiver maintained electrically disconnected foroperation during said alternations and connected for operation duringsaid reversal of the normal olarity.

15. In a printing telegraph system, a receiver, means for periodicallyconnecting said receiver for response to impulses of one polarity, meansfor normally transmitting impulses of opposite polarity during theseperiodic intervals and means for reversing the normal polarity of animpulse to operate said receiver.

16. In a printing telegraph system, a receiver, means for rendering saidreceiver alternately responsive to impulses of opposite olarity, meansfor normally transmitting impulses of opposite polarity from that towhich the receiver is responsive and means for reversing the normalpolarity at any interval for operating said receiver.

17. In a-printing telegraph receiver, a receiver comprising a neutralrelay, means for transmitting impulses of opposite polarity, said relaybeing unresponsive to said impulses and means for reverslng the normalpolarity of one of said impulses for operating said circuits for saidrelay and receiver, means responsive to impulses of successive reversalsof polarity for further preparing said alternate circuits, said receivernormally operating out of phase with said vibrator.

20. In a printing telegraph system, a re-' ceiver relay, a plurality ofcircuits for-said relay, means forsuccessively preparing sa1d circuitsfor completion, means responsive to 1 received impulses for furtherpreparing said circuits, said last mentioned means being normally out ofphase with said first mentioned means. 7

21. In a printing telegraph vsystem, a receiver relay, a plurality ofcircuits for said relay, means for success vely preparing said cession,second means in synchronism but outof phase with said impulses, forsuccessively partially completing said circuits and means for shiftingthe phase of said received impulses whereby one of said circuits iscompleted by said first and second means.

- 23. In a printing telegraph system, a transmitter and a receiver, avibrator individual to said transmitter and said receiver, means foroperating said vibrator in synchronism, means controlled by saidtransmitter for transmitting impulses of alternating positive andnegative polarity to said receiver said impulses being transmitted insynchronism but out of phase with said receiver and means fortransmitting a marking impulse in phase with said receiver.

24. In a printing telegraph system, a vibrator, a transmitter controlledby said vibrator for transmitting impulses and means including saidvibrator for simultaneously storing oneof said impulses to betransmitted and transmitting the previously stored impulse.

25. In a printing telegraph system, a vibrator, a single contacttransmitter controlled for operation by said vibrator and meansincluding said vibrator for transmitting impulses originated by saidsingle contact transmitter'.

26. In a printing telegraph system, a single contact transmitter, avibrator controlling said transmitter, and means including said vibratorfor storing impulses. from said transmitter while transmitting apreviously stored impulse.

27. In a printing telegraph system, a vibrator, a transmitter,controlled by said vi- ,brator, a. receiver, a second vibratorcontrolling said receiver nieans for operating said vibrator insynchronism, means including said transmitter vibrator for. transmittingcode combinations of impulses from said transmitter, and means includingsaid receiver vibrator for operating said receiver in accordance withsaid last code combination of impulses.

28. In a transmitter,a plurality of tape controlled fingers, a controltape for sa 1d contact transmitter controlled by said fingers, and alever controlled by said tape, said lever being operative to stop therotation of said shaft only at the end of a code combination ofimpulses.-

29. A selective signaling system comprising an element capable ofperiodic motion, means including said element for generating signalingcurrents timed in accordance with the eriod of said periodic member,means wherey succeeding generated slgnaling currents are normally ofalternate polarity and means for modifying the polarity of certain ofsaid signalmg currents for producing code combinations of signalingcurrents.

30. A selective signaling system comprising vibrating means, saidvibrating means to transmit successive uniform length impulsesalternating in polarity, the length of the impulses being determined bythe vibrating means and means forreversing the polarity of certain ofsaid impulses.

31. A selective signaling system comprising vibrating means, meanscontrolled by said vibrating means to transmit successive uniform lengthimpulses alternating in condi tion, the length of-the impulses beingdetermined by the vibrating means and means for changing the conditionof certain of said impulses. J v.

' 32. "A selective signaling system-comprising vibrating means, meanscontrolled by said vibrating means to transmit successive uniform lengthimpulses alternating in condition, the length of the impulses beingdetermined by the vibrating means, means 'for changing the condition ofcertain of said impulses and means for varying the period of saidvibrating means for varying the length of the impulses.

33. A selective signaling system comprising vibrating means, saidvibrating means to transmit successive uniform length impulsesalternating in condition, the length of the impulses being determined bythe vibrating means and means for changing the condition of certain ofsaid impulses.

a cam shaft for said fingers, a single means controlled by I meanscontrolled by 34. A selective signaling'system comprising vibratingmeans, said vibrating means to transmit successive means controlled byuniform length impulses alternating in condition, the lengthof theimpulses being determined by the vibratin means, means for changing thecondition 0 certain of said impulses and means for varying the period ofsaid vibrating means for varying the length of the impulses. Y

35. A selective signaling system comprising vibrating means, meanscontrolled by said vibrating means to transmit successive uniform lengthimpulses alternating condition, the length of the impulses beingdetermined by the vibrating means, a magnet periodically energized bysaid vibrating means, an escapement controlled by said magnet and asingle tape controlled electrical contact controlled by said escapementfor changing the condition of certain of said impulses.

36. A selective signaling system comprising vibrating means, meanscontrolled by said vibrating means to transmit successive uniform lengthimpulses alternating in condition, the length of the impulses beingdetermined by the vibrating means and a single tape controlledelectrical contact timed in operation by said vibrating means forchanging the condition of certain of said impulses.

37. A selective signaling system comprising a vibrating means,means fortiming the transmission of impulses normally reversing in condition,means for reversing the impulse condition from normal, a secondvibrating means timed in operation by the received impulses and areceiving selector timed in operation by said vibrating means, saidselector being responsive only to said received impulses when saidconditions are reversed from normal conditions.

38. A selective signaling system comprising vibrating means, meanscontrolled by said vibrating means to transmit successive uniform lengthimpulses alternating in condition, the length of the impulses beingdetermined by the vibrating means, means for changing the condition ofcertain of said impulses, a second vibrating means timed in operation bythe received impulses and a receiving selector'timed in operation bysaid vibrating means, said selector belng responsive only to saidreceived impulses when said conditions are reversed from'normalconditions.

39. A selective signaling system comprising vibrating means, meanscontrolled by said vibrating means to transmit successive uniform lengthimpulses alternating in condition, the length of the impulses beingdetermined by the vibratin means, means for changing the condition 0certain of said impulses, a second vibrating means timed in operation bythe received mpulses and a receiving selector timed 1n operatlon by saldvibrating means, said selector being responll sive only to said receivedimpulses when said conditions are reversed from normal conditrons. r

40. In a signaling system, a pair of transmitting relays, meanscontrolling said'relays for normally transmitting, alternate impulsecondit1ons, transmitting means for selective- 1y modifying thetransmitting conditions of said relays for'var ing the conditions ofsaid 7 mitting means for controlling the length of the transmittedimpulses, and means for varying the 42. In a single channel telegraph,means to transmit a series of permutation code signals so that theinterval between the last impulse of one signal and the first impulse ofthe next signal is the same as the, interval between succeeding impulsesin the same signal and means to stop the transmission between succeedingsignals.

43. In a sin le channel telegraph, means to transmit a series ofpermutation code signals so that the interval between the last impulseof one signal and the first impulse of the next signal is the same asthe interval between succeeding impulses in the same signal and a singlemagnet repeater to directly record 3 the characters corresponding tosaid signals 1n print.

'44. In a single channel telegraph, means to transmit a series ofpermutation code signals so that the interval between the last impulseof one signal and the first impulse of the next signal is the same asthe interval between succeeding impulses in the same signal, asi'nglemagnet receiver embodying a series of e permutation in the code, andmeans to selectively operate said elements according to the signaltransmitted.

45. In a single channel telegraph, means to transmlt a series ofpermutation code sig-t nals so that the interval between the lastimpulse of one signal and the first impulse of the next signal is thesame as the interval between succeeding impulses in the same signal, aseries of elements one corresponding to each permutation in the code,and means comprising a single magnet to control said elements accordingto the signal transmitted.

46. A selective signalin system comprising an element capable o periodicmotion. means including said element for enerating signahng impulsestimed in accor ance with eriod of said vibrating means. Y

ements one corresponding to each whereby the generated signalingimpulses are composed of marking and spacing conditions, successivemarkmg or spacmg conditions being of opposite polarity, and means timedin operation by said periodic member for modifying said signalingimpulses.

48. A selective signalin means including said element for generatingsignaling impulses timed in accordance with the period of said periodicmember, means for varying the period of said periodic member, meanswhereby the generated signaling impulses are composed of marking andspacing conditions, successive marking and spacing conditions being ofopposite polarity, and

means for modifying the polarity condition of certain of said signalingimpulses for producing code combinations of signaling conditions.

49.-A selective signaling system comprising an element capable ofperiodic motion, means includin said element for enerating signalingimpu ses timed in accor ance with the period of said periodic member,means for varying the period of said periodic member, means whereby thegenerated signaling impulses are composed of marking and spacingconditions, successive marking and spacing conditions being of oppositepolarity, and means timed in operation by said eriodic member formodifying said signaling impulses.

50. In a single channel telegraph, means to transmit aseries ofpermutation code signals in which successive elements of the codesignals have difi'erent conditions for spacing, a

receiver comprising selector mechanism and means for periodicallyadjusting the receiver to' operate in accordance with spacing conditionsfor successive spacing impulses of different conditions. v

51'. In a single channel telegraph, means for transmitting codecombinations of marking and spacing impulse conditions in which any twosucceeding spacing conditions are of diiferent characteristics, areceiver comprising selector mechanism responsive to the received codecombinations and means whereby the selector mechanism is conditioned tooperate in accordance with spacing conditions system comprising anelement capable oi periodic motion,

' polarity.

'impulses of opposite polarity.

in response succeeding impulses diiferent characteristics. r

52. In a single channel telegraph, means for transmitting code combinatons of mark mg and spacin impulse conditions, in WhlCh an two succee mgspacing conditions are of di erent characteristics, a receivercomprising selector mechanism responsive to the received codecombinations, means whereby the selector mechanism is conditioned tooperate in. accordance with spacing conditions in response to succeedingimpulses of difl'erent characteristics, and means for modifying there-determine'd imcharacteristics of the pulses for producing mar ingimpulse conditlons.

53. In a signaling system comprising an element capab motion, meansincluding said elementfor generating signaling impulses timed inaccordance. with the period of said periodic a transmitter 1c ofperiodic member, means for varying the period of said periodic member,means whereby the generated signaling lmpuls'es are composed of markingand spacing conditions, successive marking and spacing conditions beingof op posite polarity, means timed in operation by said periodic memberfor modifyings'aid signaling impulses, a receiver comprising an elementcapable of periodic motion in synchronism with said transmitter;periodic element and means for modifying said receiver whereby itoperates in accordance with successive spacing impulse conditions inresponse to succeeding impulses of opposite 54;. In a si naling system,means to trans-- mit code com inations of impulse conditions in whichsuccessive elements of a code condition have different characteristics,a receiver capable of periodic motion and means for modifying theoperation of said receiver whereby said receiver operates in accord ancewith spacing conditions for successive 55.-In a single channeltelegraph, means to transmit a series of permutation code signals sothat the intervalbetween the last impulse of one signal and the firstimpulse of the next signal is the same as the interval betweensucceeding impulses in the same signal; a magnet responsive to saidsignals; and a recelvlng mechanism embodying rmutation code elementscontrolled through soltely mechanical connections by said magne '56. Ina single channel printing telegraph, means to transmit a series ofpermutatlon code slgnals so that the interval between the last impulseof one signal and the first impulseofv the next signal is the same asthe interval between succeeding impulses in j the same signal; a singlemagnet responsive to said signals; and receiving mechanism embodyingpermutation code elements and overlap mechanism controlled "throughsolely mechanical connections by said magnet and operative to efiectprintin of a received character while the succee ng character is beingreceived.

57. In a single channel telegraph, means to transmit a series ofpermutation code signals so that the interval between the last impulseof one signal and the first impulse of the next signal is the same asthe interval between succeeding impulses in the same signal; a singlemagnet responsive to said signals; and a single magnet having mechanicalprinting means under the control of said magnet through solelymechanical connections.

58. In a single channel type printing telegraph, means to transmit aseries of permutation code signals so that the interval between the lastimpulse of one signal and the first impulse of thenext signal is thesame as the ins terval between succeeding impulses in the same signal; aslngle magnet responsive to said signals; and a type printing receivercontrolled through solely mechanical connections of said magnet toeifect-the printing of characters corresponding tothe permutation,

code signals received by said magnet 59. In a single channel telegraph,means to transmit a series of permutation code signals so that theinterval between the last impulse of one signal and the first impulse ofthe next signal is the same as the interval between succeeding impulsesin the same signal; a single magnet and a receiver embodying permutationcode elements and overlap mechanism selectively controlled throughsolely mechanical means by said magnet to efiect recording in accordancewith one received permutation cod'e signal, while a succeedingpermutation code signal is being received.

In testimon whereof, I aflix my si nature.

EDWA D E. KLEINSC DT.

